Papermark accuses startup of code theft from open source
Original: Hey Nico, you didn't vibe code your data room but stole it from Papermark
Why This Matters
Highlights ongoing tensions around open source code licensing and enforcement in venture-backed startups, particularly within Y Combinator portfolio companies.
Marc Seitz, representing Papermark, publicly accused a startup of copying Papermark's open source and enterprise-licensed code for a data room product, demanding immediate takedown and citing copyright and license violations.
Marc Seitz posted on X on June 25, 2026, alleging that a startup called Vibe Code had not developed its own data room solution but instead used Papermark's open source and enterprise-licensed code without permission. Seitz characterized the alleged infringement as copyright and license violation, stating the product should be removed immediately. He framed the issue beyond typical startup culture, saying 'It's not moving fast and breaking things, it's fraud' and expressed concern about the credibility of the company and its association with the Y Combinator community. The post tagged Y Combinator leadership including Garry Tan and other investors, escalating the dispute to prominent figures in the startup ecosystem. The post received significant engagement with 902 replies, 86 retweets, and 52 likes.