Your own tweets, yes. Using others' content would require their permission.
That is a description of copyright infringement.
Without a license, yes.
No.
Innocent infringement is a violation of copyright without willful intent. Accidentally moving an mp3 onto a shared drive would be innocent infringement.
Using a logo without permission would be trademarkinfringement.
The picture itself is protected by copyright; downloading it without permission would be copyright infringement.
Yes. Editing an existing image (no matter how much/little) does not void the original creators copyright and without permission is still considered infringement.
Copying, altering, distributing, or performing/displaying the file without permission from the copyright holder or an exemption in the law would be considered infringement.
Without permission, yes.
Altering, copying, distributing, or in certain cases displaying a work without permission of the copyright holder is an infringement of his or her copyright.
If it is recognizable as a copyright or trademark-protected character, you would need permission from the owner.
The reproduction or use of someone else's copyright material without permission or license.Copyright infringement is the unauthorized or prohibited use of works under copyright, infringing the copyright holder's exclusive rights, such as the right to reproduce or perform the copyrighted work, or to make derivative works.