digraph "ppp" {
size="5,5";

node [fillcolor="#d8f8d8",style=filled];
"ppp 2.4.0" [label="ppp-2.4.0\nPaul Mackerras"];
"ppp 2.4.1" [label="ppp-2.4.1\nPaul Mackerras"];
"ppp 2.4.2" [label="ppp-2.4.2\nPaul Mackerras\nReleased 2004-02\nMPPE by Frank Cusack"];
"ppp 2.4.3" [label="ppp-2.4.3\nPaul Mackerras\nReleased 2004-11\nMPPE by Frank Cusack"];

node [fillcolor="#ffd0d0",style=filled];
"ppp-mppe 2.4.0" [label="ppp-mppe-2.4.0\nMPPE by Paul Cadach\nOpenSSL Licensed"];
"ppp-mppe 2.4.1" [label="ppp-mppe-2.4.1\nMPPE by Paul Cadach\nOpenSSL Licensed"];

node [fillcolor="#d6e8ff",style=filled];
"ppp-mppe-mppc 2.4.2" [label="ppp-mppe-mppc-2.4.2\nMPPE & MPPC by Jan Dubiec\nPatent Infringing"];
"ppp-mppe-mppc 2.4.3" [label="ppp-mppe-mppc-2.4.3\nMPPE & MPPC by Jan Dubiec\nPatent Infringing"];

"ppp 2.4.0" -> "ppp 2.4.1";
"ppp 2.4.1" -> "ppp 2.4.2";
"ppp 2.4.2" -> "ppp 2.4.3";
"ppp 2.4.0" -> "ppp-mppe 2.4.0";
"ppp 2.4.1" -> "ppp-mppe 2.4.1";
"ppp-mppe 2.4.0" -> "ppp-mppe 2.4.1";
"ppp 2.4.2" -> "ppp-mppe-mppc 2.4.2";
"ppp-mppe-mppc 2.4.2" -> "ppp-mppe-mppc 2.4.3";
"ppp 2.4.3" -> "ppp-mppe-mppc 2.4.3";
}