@Ragashingo Seven Seas sometimes puts works on Humble Bundle DRM free which is probably the ideal, but it might not happen for a long time.

I normally buy my ebooks through Kobo.com which uses Adobe DRM. It's not restricted to Kobo devices, you can load it up on any device that's registered through the Adobe Digital Editions.

I also de-DRM my own purchased books using Calibre and a plugin, so that's another method you could do (there are multiple ways to remove the DRM). Once it's setup it's not too difficult