Registrations often name a rightsholder several ways (“Wiley Publishing, Inc.”, “John Wiley & Sons, Inc.”). Step 1 lists the names on record that match; tick the ones that are yours, then check them.
What this check counts
Your registered books. Each U.S. registration (TX, 1978–2025) whose Copyright Office record names an organization you tick as claimant, matched to the dated catalogs of LibGen (25 snapshots, 2015–2025), Z-Library (2022–2025), the Books3 file list and the Internet Archive’s lending library. Registrations of the same title by the same first author count as one book, so a new edition does not count twice. The claimant is the owner named when the work was registered, not necessarily the owner today, and individuals are not listed here: check authors by name.
Registered before the download. The same date screen as our reports: a book counts against a company’s download when one of its registrations is dated before the earliest date any copy of it in that dataset could have been taken, or within three months of publication when it was published before that date, and before the same company’s earlier downloads of it. Under 17 U.S.C. § 412 that timing is a condition for statutory damages and attorney’s fees. It does not limit actual damages or profits, which is where the number of works matters most.
Limits. Matching is automated: registration matches are candidates to confirm against the linked Office record, and expect some misses and some books that are not yours. A catalog listing shows that a file was in a dated catalog; it does not by itself show that any company downloaded it. Works on the Bartz v. Anthropic settlement’s Works List were released as to Anthropic, and this check does not mark them. Research support, not legal advice.
Want the full report? It lists every registration with its number, date and Office record, every catalog listing with the library’s file ID and MD5, and the per-book date screen against each download. Ask for a quote.