Whether the paper database of Paperpass contains previous master's papers depends on the source and collection of its database. Generally speaking, Paperpass mainly includes webpage resources on the Internet, as well as some academic journals and conference papers. However, whether the master's thesis in previous years is included or not needs to be specifically inquired about the database update of Paperpass.

Different duplicate checking systems have different algorithms and databases, so the duplicate checking results will be different. For the first draft of the paper, it is suggested that the paper series free duplicate checking software such as paperfree, papertime and paperday can be used for testing, and for the final draft, the duplicate checking system required by the school can be used for testing. Ensure the accuracy and effectiveness of duplicate checking.