diff --git a/db/schema.sql b/db/schema.sql
index d979465..fd014c0 100644
--- a/db/schema.sql
+++ b/db/schema.sql
@@ -2,6 +2,13 @@
 -- A "model" is one logical download (a Thingiverse thing, a Printables model, a
 -- single uploaded STL). A model owns one or more files (the actual .stl/.3mf/...).
 
+-- Per-license commercial-use policy. Auto-registered as licenses are seen;
+-- editable in Settings. commercial: true=sellable, false=non-commercial, null=unknown.
+CREATE TABLE IF NOT EXISTS license_rules (
+  name       TEXT PRIMARY KEY,
+  commercial BOOLEAN
+);
+
 -- App users (email/password auth).
 CREATE TABLE IF NOT EXISTS users (
   id            SERIAL PRIMARY KEY,
diff --git a/lib/licenses.js b/lib/licenses.js
index 7a7a489..5b4e569 100644
--- a/lib/licenses.js
+++ b/lib/licenses.js
@@ -11,8 +11,9 @@ function inferCommercial(text) {
   if (/non-?commercial|personal use|community use|[-_\s]nc([-_\s]|$)|exclusive|standard digital file|all rights reserved|^\s*none\s*$|charge money|shall not[^.]*\bsell|not be sold/.test(s)) {
     return false;
   }
-  // Clearly permissive (commercial use OK). NC variants are already excluded above.
-  if (/cc0|public ?domain|creative commons|attribution|cc[-_\s]?by|^\s*mit\b|^\s*bsd\b|^\s*l?gpl\b|royalty[- ]free|commercial use (is )?(allowed|permitted)|may be sold/.test(s)) {
+  // Clearly permissive (commercial use OK). NC variants are already excluded above,
+  // so any remaining CC "BY" code (by, by-sa, by-nd) allows commercial use.
+  if (/cc0|public ?domain|creative commons|attribution|cc[-_\s]?by|(^|[-_\s])by([-_\s]|$)|by[-_](sa|nd)|share[- ]?alike|^\s*mit\b|^\s*bsd\b|^\s*l?gpl\b|royalty[- ]free|commercial use (is )?(allowed|permitted)|may be sold/.test(s)) {
     return true;
   }
   return null;
diff --git a/lib/store.js b/lib/store.js
index 6627347..9396244 100644
--- a/lib/store.js
+++ b/lib/store.js
@@ -208,6 +208,39 @@ async function deleteProject(id) {
   return rowCount > 0;
 }
 
+// ---------------------------------------------------------------- license rules
+async function getLicenseRule(name) {
+  const { rows } = await db.query('SELECT name, commercial FROM license_rules WHERE name = $1', [name]);
+  return rows[0] || null;
+}
+
+async function upsertLicenseRule(name, commercial) {
+  await db.query(
+    `INSERT INTO license_rules (name, commercial) VALUES ($1, $2)
+     ON CONFLICT (name) DO UPDATE SET commercial = EXCLUDED.commercial`,
+    [name, commercial ?? null]);
+}
+
+async function listLicenseRules() {
+  const { rows } = await db.query(`
+    SELECT lr.name, lr.commercial, COUNT(m.id)::int AS model_count
+    FROM license_rules lr
+    LEFT JOIN models m ON m.license = lr.name
+    GROUP BY lr.name, lr.commercial
+    ORDER BY lr.name`);
+  return rows;
+}
+
+async function distinctModelLicenses() {
+  const { rows } = await db.query("SELECT DISTINCT license FROM models WHERE license IS NOT NULL AND license <> ''");
+  return rows.map((r) => r.license);
+}
+
+// Push a rule's value onto every model that carries that license.
+async function applyLicenseRuleToModels(name, commercial) {
+  await db.query('UPDATE models SET commercial_use = $2 WHERE license = $1', [name, commercial ?? null]);
+}
+
 // ---------------------------------------------------------------- users / auth
 async function countUsers() {
   const { rows } = await db.query('SELECT COUNT(*)::int AS n FROM users');
@@ -287,4 +320,5 @@ module.exports = {
   getSetting, setSetting,
   countUsers, getUserByEmail, getUserById, createUser, updateUserPassword,
   createPasswordReset, getValidReset, markResetUsed,
+  getLicenseRule, upsertLicenseRule, listLicenseRules, distinctModelLicenses, applyLicenseRuleToModels,
 };
diff --git a/public/app.js b/public/app.js
index f222434..bb59b54 100644
--- a/public/app.js
+++ b/public/app.js
@@ -420,6 +420,7 @@ async function openSettingsModal() {
       const s = settings[input.dataset.setting];
       if (s && !s.secret && s.value) input.value = s.value;
     });
+    await renderLicenseRules();
   } catch (err) {
     document.getElementById('settingsStatus').textContent = 'Could not load settings: ' + err.message;
   }
@@ -776,6 +777,44 @@ async function handleImport(e) {
   }
 }
 
+async function renderLicenseRules() {
+  const wrap = document.getElementById('licenseRules');
+  let rules;
+  try { rules = await (await fetch('/api/licenses')).json(); }
+  catch { wrap.textContent = 'Could not load licenses.'; return; }
+  if (!rules.length) { wrap.innerHTML = '<p class="form-hint">No licenses yet — import some models.</p>'; return; }
+  const opt = (v, sel) => `<option value="${v}"${sel ? ' selected' : ''}>`;
+  wrap.innerHTML = rules.map((r) => {
+    const cur = r.commercial === true ? 'true' : r.commercial === false ? 'false' : '';
+    return `<div class="license-row">
+      <span class="license-name" title="${escapeHtml(r.name)}">${escapeHtml(r.name)} <em>(${r.model_count})</em></span>
+      <select class="license-select" data-license="${escapeHtml(r.name)}">
+        ${opt('true', cur === 'true')}Sellable</option>
+        ${opt('false', cur === 'false')}Non-commercial</option>
+        ${opt('', cur === '')}Unknown</option>
+      </select>
+    </div>`;
+  }).join('');
+  wrap.querySelectorAll('.license-select').forEach((sel) => {
+    sel.addEventListener('change', () => handleLicenseChange(sel.dataset.license, sel.value));
+  });
+}
+
+async function handleLicenseChange(name, value) {
+  const commercial = value === 'true' ? true : value === 'false' ? false : null;
+  try {
+    const res = await fetch('/api/licenses', {
+      method: 'PUT',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ name, commercial }),
+    });
+    if (!res.ok) throw new Error((await res.json()).error);
+    await loadData(); // model badges reflect the new policy
+  } catch (err) {
+    alert('Could not update license: ' + err.message);
+  }
+}
+
 async function handleSaveSettings(e) {
   e.preventDefault();
   const status = document.getElementById('settingsStatus');
diff --git a/public/index.html b/public/index.html
index 7801b96..9e17d16 100644
--- a/public/index.html
+++ b/public/index.html
@@ -230,6 +230,10 @@
           </div>
           <p class="form-hint">Status: <span class="setting-status" data-status="smtp_host">—</span>. Needed for "forgot password" emails.</p>
 
+          <h3 class="settings-group-title">License types — which are sellable</h3>
+          <div id="licenseRules" class="license-rules"></div>
+          <p class="form-hint">New licenses auto-register as you import. Changing one updates every model with that license.</p>
+
           <div class="form-actions">
             <button type="button" class="btn btn-secondary" id="cancelSettings">Cancel</button>
             <button type="submit" class="btn btn-primary">Save</button>
diff --git a/public/styles.css b/public/styles.css
index 0d82b39..11d7982 100644
--- a/public/styles.css
+++ b/public/styles.css
@@ -262,3 +262,10 @@ label { display: block; font-size: 13px; font-weight: 500; color: var(--text-mut
 .auth-form .btn-link { color: var(--text-muted); align-self: center; }
 .auth-form .btn-link:hover { color: var(--accent); }
 .auth-error { margin-top: 14px; color: var(--text-muted); font-size: 13px; text-align: center; min-height: 18px; }
+
+/* ---- license rules ---- */
+.license-rules { display: flex; flex-direction: column; gap: 6px; margin-bottom: 8px; }
+.license-row { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
+.license-name { font-size: 13px; color: var(--text); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+.license-name em { color: var(--text-dim); font-style: normal; }
+.license-select { width: auto; flex-shrink: 0; padding: 6px 10px; font-size: 13px; }
diff --git a/server.js b/server.js
index 5bdbbc1..05dcb1c 100644
--- a/server.js
+++ b/server.js
@@ -245,6 +245,30 @@ app.post('/api/auth/reset', async (req, res, next) => {
   } catch (e) { next(e); }
 });
 
+// ----------------------------------------------------------------- license rules
+// List all known licenses + their commercial-use policy (auto-registers any
+// license currently used by a model that isn't in the table yet).
+app.get('/api/licenses', async (req, res, next) => {
+  try {
+    for (const name of await store.distinctModelLicenses()) {
+      if (!(await store.getLicenseRule(name))) await store.upsertLicenseRule(name, licenses.inferCommercial(name));
+    }
+    res.json(await store.listLicenseRules());
+  } catch (e) { next(e); }
+});
+
+// Set a license's policy and apply it to every model with that license.
+app.put('/api/licenses', async (req, res, next) => {
+  try {
+    const { name } = req.body || {};
+    if (!name) return res.status(400).json({ error: 'License name required' });
+    const c = req.body.commercial === true ? true : req.body.commercial === false ? false : null;
+    await store.upsertLicenseRule(name, c);
+    await store.applyLicenseRuleToModels(name, c);
+    res.json({ ok: true });
+  } catch (e) { next(e); }
+});
+
 // Mark the first-run setup wizard as done (so it won't show again).
 app.post('/api/setup/complete', async (req, res, next) => {
   try {
@@ -339,23 +363,23 @@ app.post('/api/models/:id/refresh-metadata', async (req, res, next) => {
 // Returns { license, commercial, description } from the model's source.
 async function refreshMetadata(model) {
   const site = model.source_site;
-  if (site === 'cubee3d') return { license: 'Cubee3D Commercial License', commercial: true };
+  if (site === 'cubee3d') return { license: 'Cubee3D Commercial License', commercial: await resolveCommercial('Cubee3D Commercial License', true) };
   if (site === 'printables' && model.source_id) {
     const { value: token } = await resolveSetting('printables_token');
     const p = await printables.fetchModel(model.source_id, token);
-    return { license: p.license, commercial: licenses.inferCommercial(p.licenseContent || p.license) };
+    return { license: p.license, commercial: await resolveCommercial(p.license, licenses.inferCommercial(p.licenseContent || p.license)) };
   }
   if (site === 'thingiverse' && model.source_id) {
     const { value: token } = await resolveSetting('thingiverse_token');
     if (!token) throw new Error('Thingiverse token required (set it in Settings).');
     const meta = await thingiverse.fetchModel(model.source_id, token);
-    return { license: meta.license, commercial: licenses.inferCommercial(meta.license), description: meta.description };
+    return { license: meta.license, commercial: await resolveCommercial(meta.license), description: meta.description };
   }
   // makerworld / web: read the page (FlareSolverr handles Cloudflare).
   const html = await fetchPageHtml(model.source_url);
   const meta = generic.parseMetadata(html, model.source_url);
   const license = site === 'makerworld' ? makerworld.parseLicense(html) : meta.license;
-  return { license, commercial: licenses.inferCommercial(license), description: meta.description };
+  return { license, commercial: await resolveCommercial(license), description: meta.description };
 }
 
 // Re-download files from the source into an existing model (recovers imports
@@ -553,7 +577,7 @@ app.post('/api/import', async (req, res, next) => {
         return [];
       });
       license = makerworld.parseLicense(html) || license;
-      commercial = licenses.inferCommercial(license);
+      commercial = await resolveCommercial(license);
     } else if (detected.site === 'printables' && detected.id) {
       const result = await downloadPrintablesFiles(detected.id).catch((err) => {
         console.warn('Printables file download failed:', err.message);
@@ -561,13 +585,13 @@ app.post('/api/import', async (req, res, next) => {
       });
       files = result.files;
       if (result.license) license = result.license;
-      commercial = result.commercial ?? licenses.inferCommercial(license);
+      commercial = result.commercial ?? await resolveCommercial(license);
     } else if (detected.site === 'cubee3d') {
       // Auth-gated Wix site — files added manually. You hold a commercial license.
       license = 'Cubee3D Commercial License';
-      commercial = true;
+      commercial = await resolveCommercial(license, true);
     } else {
-      commercial = licenses.inferCommercial(license);
+      commercial = await resolveCommercial(license);
     }
 
     const thumbnail = (meta.image ? await downloadImageThumbnail(meta.image) : null) || pickThumbnail(files);
@@ -619,6 +643,17 @@ async function fetchPageHtml(url) {
 
 const sleep = (ms) => new Promise((r) => setTimeout(r, ms));
 
+// Commercial-use for a license name, from the license_rules table. Unknown
+// licenses are auto-registered with a best-effort default (overridable in Settings).
+async function resolveCommercial(licenseName, fallback) {
+  if (!licenseName) return null;
+  const rule = await store.getLicenseRule(licenseName);
+  if (rule) return rule.commercial;
+  const seed = fallback !== undefined ? fallback : licenses.inferCommercial(licenseName);
+  await store.upsertLicenseRule(licenseName, seed);
+  return seed;
+}
+
 // Download every printable instance of a MakerWorld model (needs token + FlareSolverr).
 // skipNames: original filenames already present (so a re-download only adds new ones).
 async function downloadMakerworldFiles(html, skipNames = new Set()) {
@@ -676,7 +711,7 @@ async function downloadPrintablesFiles(printId, skipNames = new Set()) {
     fs.writeFileSync(filePath, Buffer.from(await resp.arrayBuffer()));
     files.push(describeFile(filePath, fileName, f.name));
   }
-  const commercial = licenses.inferCommercial(model.licenseContent || model.license);
+  const commercial = await resolveCommercial(model.license, licenses.inferCommercial(model.licenseContent || model.license));
   return { files, license: model.license, commercial };
 }
 
@@ -727,7 +762,7 @@ async function downloadAndCreateModel(meta, projects) {
     source_url: meta.source_url,
     source_id: meta.source_id,
     license: meta.license,
-    commercial_use: licenses.inferCommercial(meta.license),
+    commercial_use: await resolveCommercial(meta.license),
     designer: meta.designer,
     tags: meta.tags,
     projects,