Q: Extract the answer to the question from the following context. Question: Who own's NDRM? Context: PlayStation 3 console protects certain types of data and uses digital rights management to limit the data's use. Purchased games and content from the PlayStation Network store are governed by PlayStation's Network Digital Rights Management (NDRM). The NDRM allows users to access the data from up to 2 different PlayStation 3's that have been activated using a user's PlayStation Network ID. PlayStation 3 also limits the transfer of copy protected videos downloaded from its store to other machines and states that copy protected video "may not restore correctly" following certain actions after making a backup such as downloading a new copy protected movie.
A: PlayStation

Q: Extract the answer to the question from the following context. Question: Which word can mean the solution to the equations of the theory? Context: In quantum mechanics and quantum field theory, the vacuum is defined as the state (that is, the solution to the equations of the theory) with the lowest possible energy (the ground state of the Hilbert space). In quantum electrodynamics this vacuum is referred to as 'QED vacuum' to distinguish it from the vacuum of quantum chromodynamics, denoted as QCD vacuum. QED vacuum is a state with no matter particles (hence the name), and also no photons. As described above, this state is impossible to achieve experimentally. (Even if every matter particle could somehow be removed from a volume, it would be impossible to eliminate all the blackbody photons.) Nonetheless, it provides a good model for realizable vacuum, and agrees with a number of experimental observations as described next.
A: state

Q: Extract the answer to the question from the following context. Question: Why was the location chose? Context: The capital of Danish Estonia (Danish: Hertugdømmet Estland) was Reval (Tallinn), founded at the place of Lyndanisse after the invasion of 1219. The Danes built the fortress of Castrum Danorum at Toompea Hill. Estonians still call their capital "Tallinn", which according to legend derives from Taani linna (meaning Danish town or castle). Reval was granted Lübeck city rights (1248) and joined the Hanseatic League. Even today, Danish influence can be seen in heraldic symbols. The Danish cross is on the city of Tallinn's coat of arms, and Estonia's coat of arms displays three lions similar to those found on the Danish coat of arms.
A: the place of Lyndanisse

Q: Extract the answer to the question from the following context. Question: What alternative to artificial heat provides buoyancy? Context: A solar balloon is a black balloon that is filled with ordinary air. As sunlight shines on the balloon, the air inside is heated and expands causing an upward buoyancy force, much like an artificially heated hot air balloon. Some solar balloons are large enough for human flight, but usage is generally limited to the toy market as the surface-area to payload-weight ratio is relatively high.
A:
sunlight