A Steam Community announcement has word on a weapon that's been removed from Counter-Strike: Global Offensive after a DMCA takedown notice. For those who had purchased this item, it has been replaced by a rare Valve-designed substitute, while the two claimed creators of the gun have been banned for violating the terms Valve's "low friction" submission process, which requires swearing to the originality of their work. Here's some detail:

All contributors share joint responsibility for the originality of their Workshop submission, and therefore share joint liability for claims of copyright infringement. That is, if two or more artists collaborate on a submission and the submission contains intellectual property that isn’t their own, all artists involved in the submission will share in the consequences.

For the items in question, the following steps have been taken:

• Both contributors have received Steam Community bans. They receive no proceeds from either item, and both items have been removed from the game.
• For owners of the M4A4 | Howl and Howling Dawn sticker, those items have been replaced by an alternative designed by the CS:GO team. These items will never be produced again, and have been assigned the ‘Contraband’ rarity.
• All other in-game items that involve at least one of the contributors in their revenue share have been discontinued.
• The Huntsman Case and Community Sticker Capsule have been revised to replace the copied and discontinued items.
• Moving forward, we will no longer work with the contributors and we will not ship any existing Workshop submission that credits their involvement.

The cost for everyone involved in the resolution of this issue has been significant, including our players and community members. It takes considerable time and effort for the CS:GO team to resolve copyright infringement disputes, but fortunately copying is rare – the CS:GO community has submitted tens of thousands of unique entries to the Workshop, and we have shipped dozens of your designs without a problem.