Videos that you have found online are likely to be protected by copyright. Using copyrighted material without permission is illegal.

The links that you will find below offer access to websites where internet users share links to videos that have been published freely online with the permission of the rights holder. You are allowed to use these videos, provided that you meet the given licence terms. 

Open Images
'Open Beelden': initiative of the Dutch Institute for Image and Sound (Beeld en Geluid). Includes 1300 older news items.

Prelinger Archives
More than 2000 historical American commercial, company, promotion, propaganda, educational and amateur films. Permission to use these films is not required and mentioning the original source is not obligated.

Thousands of free stock videos, motion graphics, music tracks and sound effects.