Public-goods are non-rivalrous and non-exclusive. It doesn't matter why they might be exclusive. If it's through technical means like DRM (even absent legal su

Public-goods are non-rivalrous and non-exclusive. It doesn't matter why they might be exclusive. If it's through technical means like DRM (even absent legal support for it) or (blurry, admittedly) needing an exclusive tool such an Open Source plugin for Photoshop, then it's not really a public good. The latter case is arguably a public-good within the "public" of Photoshop-users.