Anti terrorism legislation has increased the police powers to compile and store data. These powers often collide with fundamental rights, particularly with the data protection right. Regarding this the acts enacted in the last years by several German Lander can be emphasized. This work analyses three decisions ruled by the Budesverfassungsgericht where the Court points out not only that the anti terrorism legislation must observe fundamental rights but also that the new technologies are a new space which is essential to develop the personality of the people. To this end the Court reminds to the legislator that its duty of protecting citizens does not allow him to disregard the rights to freedom and also the Court adds to the bill of rights the integrity of the informatics systems because of the important role that they play currently in our lives.